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【简答题】
引入进程的主要目的是__________________________、__________________________。
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举一反三
【简答题】再见(告辞者说)(常用语)
【单选题】It's very foolish _____ it?
A.
for you to say
B.
of you to say
C.
with you saying
D.
in your saying
【单选题】It's very foolish of the commander to expose his men to _____ risks.
A.
unnecessary
B.
necessary
【简答题】It's very foolish of the commander to expose his men to ______ risks. (unnecessary, necessary)
【简答题】It's very foolish of the commander to expose his men to ___ (necessary) risks.
【单选题】如图所示,一个半径为 R 的导电圆环与一个轴向对称的发散磁场处处正交,环上各点的磁感应强度 B 大小相等、方向均与环面轴线方向成 θ 角 ( 环面轴线为竖直方向 ) 。若导电圆环上载有如图所示的恒定电流 I ,则下列说法中正确的是 ( ) 。
A.
导电圆环所受安培力方向竖直向下
B.
导电圆环所受安培力方向水平向右
C.
导电圆环所受安培力的大小为 2 BIR
D.
导电圆环所受安培力的大小为 2π BIR sin θ
【单选题】It's very foolish _____ it?
A.
for you to say
B.
with you saying
C.
of you to say
D.
in your saying
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