节流管汇的功用只是在关井时借助适当打开节流阀释放一定的钻井液。
参考答案：错
—My foot hurts when I move it.
—You must stay in bed and don't move _____.[ ]
A. much many
B. many much
C. too much
D. much too
B．伽利略
C．开普勒
D．卡文迪许
