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【多选题】
坡度的大小可用（）表示。A.
角度
B.
弧度
C.
比值
D.
圆弧线
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反馈参考答案：
举一反三
【单选题】关于空气净化技术叙述错误的是
A.
层流洁净技术可以达到100级
B.
空气处于层流状态，室内不易积尘
C.
层流净化分为水平层流和垂直层流净化
D.
层流净化区域应与万级净化区域相邻
E.
洁净室内必须保持负压
【单选题】He was caught in the heavy rain.That’s ___ he was ill.
A.
how
B.
which
C.
why
D.
what
【单选题】The reason _______ he was late again was that he was caught in a traffic jam.
A.
which
B.
in which
C.
for which
D.
of which
【多选题】当顺时针旋转收音机的开关旋钮时,其音量增大,反时针旋转,音量减小,这种旋钮和音量之间的关系符合( )。
A.
空间相合性
B.
运动相合性
C.
位置相合
D.
心理模型相合性
【单选题】The reason ______ he was late again was that he was caught in traffic jam in the rush hour. [ ]
A.
which
B.
in which
C.
for which
D.
of which
【单选题】The reason _______ he was late again was that he was caught in a traffic jam in the rush hour.
A.
which
B.
in which
C.
for which
D.
of which
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