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【单选题】
在下述何种情况下容易碰到风切变:[1分]A.
逆温层附近或靠近雷暴时
B.
当风速大于65千米/小时时
C.
有高气压时
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举一反三
【简答题】硬件组态的任务就是在STEP7中生成一个与（）完全相同的系统。
【单选题】5) Others read these articles and get ____ knowledge before making a trip. A.helpful B. fantastic C. various D. excited
A.
helpful
B.
fantastic
C.
various
D.
excited
【单选题】—May I speak to Mr Brown? —_____. I'll go and get him. [ ]
A.
Speaking
B.
Wrong number
C.
Hold on, please
D.
Yes, I am
【简答题】Choose the best answer for each blank 1. She has to __________ her passport before a trip to South Africa since it will expire next month. A. revise B. retract C. review D. renew 2. As the only...
【简答题】As you know, science plays ___1___ very important role in our education. Do you want to keep up ___2___ the latest research and discoveries in science? There are many good websites ___3___ you can che...
【单选题】The connected joints of pipe，usually made of three joints of pipe approximately 90 feet long，racked in the derrick when making a trip are called a（）.
A.
string
B.
stand
C.
joint
D.
standpipe
【单选题】带有等量异种电荷的一对平行金属板,如果两极板间距不是足够近或者两极板面积不是足够大,即使在两极板之间,它的电场线也不是彼此平行的直线,而是如图所示的曲线(电场 的方向未画出 ).在图中,若上极板带正电,虚线MN是穿过两板正中央的一条直线,则关于这个电场,以下说法正确的是( )
A.
a点的电场强度小于b点的电场强度
B.
b点的电势低于c点的电势
C.
平行金属板之间的电场,可以看做匀强电场
D.
若将一正电荷从电场中的任一点由静止释放,它必将沿电场线运动到负极板
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