单头螺纹的螺距是不相等的
参考答案:错
I can never forget the days _____ we worked together and the days ______ we spent happily together.
A.when; which
B.which; when
C.for which; that
D.on which; when
苯二氮类的药理作用不包括
()
A.镇静催眠
B.抗焦虑
C.抗惊厥、抗癫痫
D.肌肉松弛
E.镇痛