KPX-113型配水器工作筒偏孔直径为φ()mm。
A.20
B.22
C.46
D.50
参考答案:A
—Excuse me, are you Amy, from Class 2, Grade 1?
—Sorry, I'm not ________ Amy from Class 2, Grade 1 but from Class 1, Grade 2. There are two Amys in my school.
A.a
B.an
C./
D.the
毒扁豆碱用于青光眼的优点是()
A.比毛果芸香碱作用强大而且持久
B.毒副作用比毛果芸香碱小
C.水溶液稳定
D.不易引起调节痉挛
E.不会吸收中毒