盐酸普鲁卡因注射液检査的杂质是（）
A.对氨基苯甲酸
B.莨菪碱
C.游离水杨酸
D.草酸
E.罂粟酸
参考答案：C
Everyone in the village knew him, so we had _______ his house.
A．no difficulties to find
B．some difficulties in finding
C．no difficulty to find
D．no difficulty in finding
在（）钻井液中要求一定量的Ca2+。
A、细分散
B、抑制性
C、油包水乳化
D、盐水
