安全阀阀门的位置应在关闭位。
参考答案:错
(2014山东省实验中学高三第二次模拟考试)9.The publishers are confident that the books ______________ next month will sell well.
A.published
B.to be published
C.having published
D.are published
小刚在体育中考项目50m跑的测试中,体育老师记下了他跑到30m处所用的时间是5s.他跑这30m的平均速度是______m/s,合______km/h.