一个数和0相乘，得______，0除以一个______的数还得0．
一个数和0相乘，得0；0除以一个不为0的数，还得0．
故答案为：0，不为0．
瞬时式安全钳制停距离短，制停迅速，常用于高速电梯.（)
. You must do your homework now; you ______ computer games all the evening.
A．have been playing
B．play
C．are playing
D．played
