问题
选择题
Today you can ____ your father's car to school. [ ]
A. take
B. go
C. by
D. in
答案
答案：A
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Today you can ____ your father's car to school. [ ]
A. take
B. go
C. by
D. in
答案：A
．汽缸B、A两部分气体体积之比
=2∶1．然后关闭阀门，并让汽缸绕OO'轴作匀速转动．为维持汽缸B部分气体的体积不小于原体积的3/4．求:转动的角速度的值．（已知外界气压为
，弹簧劲度系数为k．转动过程温度不变，摩擦不计）