钻井液的含钙量是指所含（）。
A、游离钙的浓度
B、游离石灰的浓度
C、钙的浓度
D、KCl的浓度
参考答案：A
There ______ quantities of apples in the basket and there was ______ milk in the bucket.
A．were; a number of
B．was; quantities of
C．was; a good many
D．were; a quantity of
下列药材中除哪一项外均易发霉？（）
A.牛膝、玉竹、天冬
B.三七、川芎、北沙参
C.天花粉、白术、葛根
D.附片、知母、紫菀
