做等速运动的凸轮机构,一般适用凸轮作()和从杆质量不大的场合。
参考答案:低速运动
Henry ________ be at home because he phoned me from the farm just now.[ ]
A. mustn't
B. might not
C. isn't able to
D. can't
「田中さんも コーヒー ( )。」「はい、ありがとうございます。」
A.飲むの
B.飲むな
C.飲む
D.飲むかい