较大面积人工回填用打夯机夯实。两机平行时其间距不得小于()。
A.3m
B.4m
C.5m
D.6m
参考答案:A
单词拼写 (共10小题;每小题1分,满分10分)
根据句意填入适当形式的词,首字母或中文已给出。
小题1:_ If you go to New York, you can enjoy the beauty of the S______ of Liberty by yourself.
小题2:_ While traveling, we often find many r_________ paintings on the walls of temples.
小题3:_The first living ______________(生物) sent into space was a dog named Laika.
小题4:_. Both sides are trying to find a peaceful s___________ to the nuclear problem.
小题5:_ Look! The excellent dancer is dancing ______________(优雅地) on the stage.
小题6:_The world-famous artist’s works are on _______________(展览) here.
小题7:_ He worked so hard that e_______________ he made himself ill.
小题8:_ It was our ____________ (祖先) who invented the paper-making, the compass and so on.
小题9:_ They give 10% d________________ for cash payment.
小题10:_ At the crossing of the street you can find the ____________ (农业的) Bank of China.
A.a光的全反射临界角小于b光的全反射临界角
B.用同一干涉装置可看到a光的干涉条纹间距比b光宽
C.在该介质中a光的传播速度小于b光的传播速度
D.如果b光能使某种金属发生光电效应,a光也一定能使该金属发生光电效应