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【单选题】
电梯不能不能自动关，引起的原因可能是( )。A.
电梯处于检修状态
B.
选层器自动定向触点有的接触不良
C.
开门限位开关损坏或未复位
D.
电机或关门继电器损坏
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举一反三
【单选题】Duke Ellington's orchestra,______ his own often complex compositions, made many innovations in jazz.
A.
he played
B.
playing
C.
that it played
D.
was playing
【简答题】为了检测下述组分,采用气相色谱分析时宜选择哪种检测器? (1)作物中含氯农药的残留骰;(2)酒中水的含量;(3)啤酒中微量硫化物;(4)苯和二甲苯中的异构体。
【简答题】The news was made ______ (know) to the public at last.
【简答题】The whole nation was ______ when news came that China's first man-made satellite had been successfully launched．中国第一颗人造卫星发射成功的消息传来时，整个国家都轰动了。
【简答题】在气相色谱分析中,常用到如下检测器:电子捕获检测器;氢火焰离子化检测器;热导检测器;火焰光度检测器。为了测定下面组分,请选合适的检测器: 农作物中含氯农药残留量, ;酒中的水量, ;啤酒中的硫化物, ;蜜饯中的甜蜜素, ___________ 。
【简答题】为了检测下述组分，采用气相色谱分析时宜选择哪种检测器？ （1）作物中含氯农药的残留量， （2）酒中水的含量， （3）啤酒中微量硫化物， （4）苯和二甲苯中的异构体。
【单选题】– I hear that as many as 150 people were killed in the earthquake. – Yes,_____ news came as ______ shock to us.
A.
a; a
B.
the; a
C.
/; /
D.
/; a
【单选题】The news made many students ______ that many universities still bind the issue of diplomawith their CET4 results.
A.
awful
B.
upset
C.
tuneless
D.
lucky
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