线路轨距是指钢轨头部踏面下_mm范围内两股钢轨工作边之间的最小距离
A.10
B.16
C.8
D.6
参考答案:B
单词拼写(共10小题;每小题1分,满分10分)
根据题中所给的中文提示或首字母写出符合句意的单词的正确形式。
小题1:.A large q__________ of air-conditioners has been sold since the temperature is high.
小题2:.It rained yesterday and as a c__________ the match was cancelled.
小题3:.The prices of the dolls r__________ from $ 5 to $ 100.
小题4:.We were really a__________ about you. You shouldn’t have left home without a word.
小题5:.I could hardly express my a__________ of your help.
小题6:The police __________(射击) at him, but he escaped.
小题7:What he said did not __________(惹恼) me , for I knew he did not mean it.
小题8:.If Paul __________(辞职), who will get the job ?
小题9:.He owes his success to his teacher’s __________(鼓励).
小题10:.It is our duty to help the __________(残疾).
若把“神舟”六号载人飞船绕地飞行的运行看作是在同一轨道上的匀速圆周运动,且已知运行的周期为T,地球表面的重力加速度为g,地球半径为R,用T、g、R能求出哪些与“神舟”六号载人飞船有关的物理量?分别写出计算这些物理量的表达式(不必代入数据计算).