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【单选题】
The naughty boy sat restlessly on the chair with his two legsA.
swerving
B.
swaying
C.
swinging
D.
skidding
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【单选题】一等径圆管内径 d=100mm ,流通运动粘度 ν=1.306×10 -6 m 2 /s 的水,管中保持层流流态的最大流量为( )。
A.
2.36 × 10 -1 m 3 /s
B.
2.36 × 10 -2 m 3 /s
C.
2.36 × 10 -3 m 3 /s
D.
2.36 × 10 -4 m 3 /s
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【简答题】Protel DX放置导线的菜单命令是 。
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A.
Office System Open System
B.
Open Source
C.
Open System
D.
Operating System
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