有机磷酸酯农药抑制的酶是
A．胆碱酯酶B．己糖激酶C．琥珀酸脱氢酶D．柠檬酸合成酶E．异柠檬酸脱氢酶
参考答案：A
My father worked day and night. Otherwise, there ________ no one to support the family.
A．would be
B．must be
C．would have been
D．must have been
定性研究是基于______方法论。
A．实证主义 B．人文主义 C．叙事主义 D．反实证主义
