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【简答题】
在潮湿环境、粉尘大的环境,安全电压降为___,甚至是___。
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举一反三
【单选题】The rapid development of laser techniques means that ______.
A.
in another ten years we shall be able to cure cancer
B.
surgery is likely to improve considerably
C.
we shall be able to treat all the diseases we suffer from
D.
we are now able to treat most forms of cancer
【简答题】Let's take the train there near the bank, __________ we? [A] will [B] won't [C] shall [D] shan't
【简答题】我国反不正当竞争法规定:经营者在市场交易中，应当遵循自愿、平等、公平、__________的原则，遵守公认的商业道德。
【单选题】神经细胞在接受一次阈上刺激产生动作电位的过程中，兴奋性的周期变化是
A.
相对不应期—绝对不应期—超常期—低常期
B.
绝对不应期—相对不应期—超常期—低常期
C.
有效不应期—相对不应期—超常期
D.
有效不应期—相对不应期—低常期
E.
绝对不应期—超常期—低常期—相对不应期
【单选题】What does the passage mainly discuss?
A.
The experiments on the common cold.
B.
The myths about the common cold.
C.
An explanation of why and how people catch colds.
D.
The continued spread of the common cold.
【单选题】What encouraged the writer to give up smoking?
A.
Something he had heard.
B.
His bad health.
C.
Something he had read.
D.
Something his wife told him.
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