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[主观题]

Open ullage holes in tanks which are not gas-free must be protected by ______.A.PV valvesB

Open ullage holes in tanks which are not gas-free must be protected by ______.

A.PV valves

B.warning signs

C.flame screens

D.stop-check valves

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发布时间：2020-09-17

更多“Open ullage holes in tanks which are not gas-free must be protected by ______.A.PV valvesB”相关的问题

第1题

数控编程中，取消钻孔模态指令是（）。

A.HOLES

B.MCALL

C.ROT

D.TRANS

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第2题

Small holes should be made in the（) cloth to let the moisture out.

A、dry

B、waterproof

C、wet

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第3题

In winter the Eskimos ______.A．shut themselves up in igloosB．hunt seals on iceC．fish by ma

In winter the Eskimos ______.

A．shut themselves up in igloos

B．hunt seals on ice

C．fish by making holes in the ice

D．raise reindeer for its milk

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第4题

若加工圆周排孔，圆周直径为100mm，孔个数为5，首孔角度为0，则孔位置可写HOLES20，0，100，0，5，72。（）

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第5题

Which of the following is not true of the sun spots？A．They are caused by the magnetic pull

Which of the following is not true of the sun spots？

A．They are caused by the magnetic pull from inside the sun.

B．They are areas of high- level magnetism.

C．They are actually black holes in the sun.

D．They reach their peak in a cycle of 11 years.

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第6题

Modem ideas are beginning to influence the Eskimos, but not enough to make much difference

to their way of life. They still spend the winter in igloos, the round huts that are built of snow frozen hard. They still travel on sleds that are pulled by dogs. The winter is too cold for hunting, so during that season they live on the stores of seal meat that they have killed in the summer. But seal meat is not the only kind of food that they eat. In summer they hunt bears and reindeer, a type of deer With long branching horns that is used for its milk, meat and skin. They also fish all the year round. The Eskimos who are hunters in summer are fishermen in winter. In winter they make holes in the ice and catch their fish through the holes that they have made. The Eskimos are adaptable. That is why they are able to live in Arctic regions.

Which is the main topic of this passage？

A．Modem ideas are beginning to influence the Eskimos.

B．Why are the Eskimos able to live in Arctic regions？

C．The Eskimos are adaptable.

D．Eskimos' way of life has not changed very much.

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第7题

February 1, 2015 Dear Ms. Lin, Special Requirements for Packing （Order No. MI 063) Wi

February 1, 2015 Dear Ms. Lin, Special Requirements for Packing (Order No. MI 063) With reference to the order of woolen gloves above, the packing instructions1 (list) as follows: The woolen gloves 2 (pack) in twenty boxes, and the boxes3 (pack) in a carton. All the boxes 4 (put) close together inorder to avoid being flattened. The carton 5 (line) with waterproof cloth inside and 6(strap) with metal bands outside, which is strong enough for seatransportation. Small holes 7 (make) in the waterproof cloth to let the moistureout. Please 8 (follow) the packing instructions above. Thank you foryour attention. Yours sincerely, Daniel Anderson

1. The woolen gloves should be .()

A. packed in a carton

B. strong enough

C. packed in twenty boxes

2. All the boxes were put close together .()

A. for sea transportation

B. to avoid being crushed

C. to be in good order

3. The carton was strapped with metal bands outside .()

A. to be strong enough

B. to let the moisture out

C. to be waterproof