Why did it take the scientists a long time to locate the planets?
A.Because there are too many of them.
B.Because they are much dimmer than their parent stars.
C.Because the scientists' method was wrong.
D.Because they are moving all the time.
第7题
用于治疗急性吐泻、疼痛、中暑、发热的三棱针刺法是
A.挑刺法
B.点刺法
C.散刺法
D.刺络法
E.透刺法
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