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【单选题】
下列药物中属于中枢兴奋药的是( )A.
咖啡因
B.
吗啡
C.
安定
D.
苯巴比妥
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【单选题】It is often more economical to supply such power from ________.
A.
transistor
B.
transformer
C.
capacitors
【简答题】用倒装句 改写下列句子。 1. A “ soft-serve” creamy dessert comes out, to be eaten right away. 【 2018 全国 II.B 】 2. As Cancy's success grows, Moore's credibility as a young enterpreneur also grows. 【 2019 北京卷 B 】...
【简答题】Rewrite the following sentences using inverted sentences. 1. A “ soft-serve” creamy dessert comes out, to be eaten right away. 【 2018 全国 II.B 】 2. As Cancy's success grows, Moore's credibility as a ...
【单选题】It is more economical to use （）, because of their greater strength and longer useful lives.正确答案A
A.
nylon ropes
B.
manila ropes
C.
sisal ropes
D.
wooden ropes
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