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【单选题】
竞争性拮抗药具有的特点是A.
与受体结合后产生效应
B.
能 降低 激动药的最大效应
C.
即使增加激动药的用量，也不能产生效应
D.
使激动药量效曲线平行右移，最大效应不变
E.
同时具有激动药的作用
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举一反三
【单选题】Which of the following is true of shipping goods via water transportation?
A.
Water transportation is an efficient way to ship perishable merchandise over long distances.
B.
Water carriers are highly flexible in their routing and time schedules.
C.
Water transportation provides in-transit services, such as the processing of goods en route.
D.
Water transportation is ideal when time is short and speed is needed.
【单选题】Why could goods from the American interior be shipped directly to the Atlantic?
A.
new shipping route
B.
new transportation system
C.
more people made new inventions
D.
new inventions
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