什么是自动扶梯和自动人行道的“梳齿板安全装置”?
参考答案:
当梯级、踏板或胶带与梳齿板啮合卡入异物有可能造成事故时,能使自动扶梯或自动人行道停止运行的电气装置。
—-Computers are becoming more and more important these years.
—-Yes. Without them human life quite different.
A.would be
B.is
C.will be
D.would have been
硫化物包括所有存在于()和其他球根状植物中的有机硫化物。