减小水击的措施是（）。
A.减小负荷
B.增加压力钢管管长
C.增加导叶关闭时间
D.减小导叶关闭时间
参考答案：C
At no time________the rules of the game.It was unfair to punish them. (2013·辽宁，26)
A．they actually broke
B．do they actually break
C．did they actually break
D．they had actually broken
有关血浆脂蛋白的描述正确的是
A．CM在脂肪组织中合成B．HDL从LDL转变而来C．VLDL可转变成LDLD．HDL和LDL竞争肝外受体
