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【判断题】
静定结构支座反力与内力的影响线都是由直线或直线段组成;在结点荷载作用下静定力的影响线也是由直线段组成。A.
正确
B.
错误
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皮皮学刷刷变学霸
举一反三
【单选题】Students shouldn't be given so difficult a problem _____ they can not work out. [ ]
A.
that
B.
which
C.
while
D.
as
【简答题】Marriage was an automatic way to makeeverything work out right. In which of the following sentences, "work out" has the same meaning as it means in the preceding sentence.A. Have you work out the righ...
【单选题】They are restless / motionless , waiting for the performance to start.
A.
restless
B.
motionless
【单选题】Its an_____difficult problem, which even many professionals cannot work out.
A.
exceedingly
B.
excessively
C.
exclusively
D.
extensively
【多选题】气相色谱进样操作要求“瞬间快速进样”,是因为( )
A.
保证样品“瞬间”完全气化且保证所有样品同时进入色谱柱
B.
保证样品快速进入色谱柱
C.
保证样品与载气均匀混合
D.
使各组分按分子量大小分离
【单选题】Which of the following statements is true?
A.
The boy prefers to go out and, work.
B.
The boy has neither much interest in school nor in work.
C.
The boy is discouraged because he didn't pass the exam.
【单选题】气相色谱进样操作要求“瞬间快速进样”,是因为( )
A.
保证样品与载气均匀混合
B.
保证样品快速进入色谱柱
C.
保证样品“瞬间”完全气化且保证所有样品同时进入色谱柱
D.
保持流速恒定
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