有很强的粘合力,可用来增加片剂的硬度,但吸湿性较强的附加剂是
A.淀粉
B.糖粉
C.药用碳酸钙
参考答案:B
根据句意,用括号中所给动词的适当形式填空。
1. My father ________ (not have ) lunch. He is very hungry.
2. ________ (bring) your reading books here tomorrow and we will do some reading.
3. You can play football after your homework ________ (finish).
4. The students ________ (tell) to learn English well last month.
5. We helped many poor children by ________ (send) them school things in the past.
测量误差产生的原因概括起来包括以下三个方面:观测者、测量仪器和()。