当1k水完全变成蒸汽后,在标准状况下其体积要增大约( )倍,因此蒸汽物理爆炸的破坏力也很大。
A.500
B.10 000
C.100
D.1500
参考答案:D
Xi’an was the last city ______ he visited when he came to China.
A.where
B.which
C.that
D.in which
液压站工作制动部分的溢流阀有何作用?