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【单选题】
活塞式压缩机（ ）压缩时的耗功小于（ ）压缩时的耗功A.
、多变
B.
绝热、多变
C.
绝热、
D.
多变、
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反馈参考答案：
举一反三
【简答题】利用波长为λ=0.59μm的平行单色光照射光栅，已知光栅上每毫米宽度内刻500条狭缝，透光狭缝宽度a=1×10 -3 mm．试求：
【单选题】PartI Vocabulary & Structure ( 25 points, 1 point for each item) Se c tion A Directions: There are 15 incomplete statements here. Complete each statement by choosing the appropriate answer from the 4 ...
A.
out, for
B.
off ,to
C.
out, in
D.
away, on
【单选题】Vocabulary and Structure (Each item: 4 point(s)) Directions: For each of the following sentences there are four choices marked A, B, C and D. Choose the best one to complete each sentence. I believe e...
A.
after
B.
if
C.
at that
D.
even if
【单选题】男婴，日龄8天，旧法接生。2天前出现哭闹易惊，吮奶困难，继而面肌及全身肌肉阵发性痉挛，应首先考虑
A.
新生儿败血症
B.
新生儿化脓性脑膜炎
C.
新生儿颅内出生
D.
新生儿肺炎
E.
新生儿破伤风
【单选题】Section two Part 3 News item 2 B: listen to the news item again and choose the best answer to complete each of the following sentences. 1 Oppositions parties are demanding 1 after a violent protest ov...
A.
a new election
B.
a new selection
C.
a new elector
D.
a new selector
【单选题】Directions: Listen to the news item and complete the following summary. Choose the best answer to complete each of the following sentences. [音频] This news item is about 1) ________.
A.
the violent protest over voting problems in Yemen
B.
the local council election in Yemen
C.
the ruling General People's Congress Party in the lead
D.
the people killed and injured during the voting in Yemen
【单选题】单色光的纯度可用仪器的狭缝宽度调节,宽度增加将会使( )
A.
单色光的纯度变差，测定灵敏度下降
B.
单色光的纯度变好，测定灵敏度下降
C.
单色光的纯度变差，测定灵敏度提高
D.
单色光的纯度变好，测定灵敏度提高
【简答题】News item 2 B: Directions: Listen to the news item again and choose A, B Cor D to complete each sentence
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