干混砂浆料应先将待检样品放入砂浆搅拌机中，再启动机器，然后将待加入规定量的水，搅拌（）。
参考答案：3-5min
Dave his father ,but his father wouldn’t listen. [ ]
A.persuaded;out of smoking
B.advised;out of smoking
C.tried to persuade;not to smoke
D.persuaded;not to smoke
最重要的吸气肌是（）
A．膈肌
B．肋间内肌
C．肋间外肌
D．腹肌
E．胸锁乳突肌
