力的法定计量单位是()。
A.牛顿(N);
B.公斤(kg);
C.千克(kg);
D.达因(dyn)。
参考答案:A
Before graduation, we had a lot of practical _____ by doing a part-time job in the company and it was
really _____ for us.[ ]
A. experience; a great experience
B. experiences; a great experience
C. experience; great experience
D. experience; great experiences
观察儿童第三磨牙牙胚情况宜采用()。
A.下颌横断片
B.口内根尖片
C.上下颌第三磨牙口外投照片
D.翼片
E.下颌前部片