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【单选题】
下列不属于机械密封使用维护注意事项的有（）。A.
安装前进行静压试验
B.
投用前
C.
运行中认真观察
D.
解体后认真查找原因
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反馈参考答案：
举一反三
【单选题】“ 人总是要死的” 谓词公式表示为 。（论域为全总个体域） M(x) ： x是人；Mortal(x) ：x 是要死的。
A.
M(x) →Mortal(x)
B.
M(x)∧Mortal(x)
C.
(∀ x) (M (x)→Mortal(x))
D.
(∃ x) (M (x)∧Mortal(x))
【单选题】Q4. How long has the company been in operation?
A.
50 years.
B.
15 years.
C.
5 years.
D.
25 years.
【单选题】How long does the Grand Slam tournaments, Wimbledon , last?
A.
One week.
B.
Two weeks.
C.
One month.
D.
Ten days.
【单选题】How long had Valentine been executed when Lupercalia was renamed?
A.
270 years.
B.
496 years.
C.
226 years.
D.
220 years.
【单选题】Conversation 2 6
A.
Getting some celebrity endorsements.
B.
Inventing some fashionable products.
C.
Putting up some fascinating ads.
D.
Setting up activities for youngsters.
【单选题】I loved that they accepted me for my socially awkward self.(Para.5)
A.
I loved that my colleagues never made me feel uncomfortable in social settings.
B.
I loved that my colleagues accepted me although I was not good at socializing.
C.
null
D.
nul
【单选题】We know from the passage that ______. ( )
A.
exposure to even tiny amounts of radiation is fatal
B.
the effect of exposure to radiation is slow in coming
C.
radiation is avoidable in space exploration
D.
astronauts in spacesuits needn't worry about radiation damage
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