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【单选题】
当显微镜视野很暗影响观察时，应当调节光亮程度，此时应采取的措施是 [ ]A.
选用大光圈
B.
换高倍目镜
C.
选用平面镜
D.
调节准焦螺旋
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举一反三
【单选题】The first textbook ______ for teaching English as a foreign language came out in the 18th century.
A.
having written
B.
to be written
C.
being written
D.
written
【单选题】The first textbook ______ for teaching as a foreign language came out in the 16th century.
A.
to write
B.
to be written
C.
writing
D.
written
【单选题】The first textbook ______ for teaching English as a foreign language came out in the 16th century.
A.
writing
B.
written
C.
to write
D.
to be written
【简答题】保和丸出自《丹溪心法》，由山楂、神 曲、半夏、茯苓、陈皮、连翘、莱菔子组成。保和丸能消食、导滞、和胃。用于食 积停滞，脘腹胀满，嗳腐吞酸，不欲饮食。 (1)处方中山楂应选用() A.生山楂 B.炒山楂 C.山楂炭 D.焦山楂 E.姜山楂 (2)下列关于莱菔子的说法，错误的是() A.保和丸中莱菔子应选用炒制品 B.保和丸中莱菔子应选用生品 C.莱菔子炮制后可使药性变升为降 D.莱菔子炒制时应该用文...
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