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【单选题】
要求振荡频率在 100HZ ~ 1KHZ 范围内可调,可采用( )正弦波振荡电路。A.
RC
B.
RL
C.
LC
D.
无法确定
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【简答题】array_search ()函数的作用是什么?
【单选题】-Where are you going to work next year? -_______ Maybe Hefei or Nanjing. [ ]
A.
I'm not so sure.
B.
I think so.
C.
That's a good idea.
D.
I hope not.
【简答题】现行公路规范中汽车荷载包括:( )和( )两种;按荷载大小汽车荷载分为:( )和 ( )两个级别。
【多选题】( 2014· 海南卷, T8 )某反应能量变化如图所示,下列说法正确的是
A.
反应过程 a 有催化剂参与
B.
该反应为放热反应，热效应等于 △ H
C.
改变催化剂，可改变该反应的活化能
D.
有催化剂的条件下，反应的活化能等于 E 1 +E 2
【单选题】听力原文：M: Do you prefer this new operation system to the old one? W: I'm not sure. I think it quite complicated and it may take time to get familiar. What does the woman think about the system?
A.
The system is too complicated.
B.
The system is familiar to her.
C.
The system is not familiar to her.
D.
She is not sure about the system.
【单选题】- Are you happy to have the two-month summer holiday? -Sure. We can relax ourselves and do many things we like.
A.
two months
B.
two month
C.
two months’
D.
two month’s
【简答题】现行公路桥涵设计规范中,汽车荷载包括 和 两种。
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