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【单选题】
下 列叙述不正确的是 （ ）A.
CH 4 与C 4 H 10 互为同系物
B.
C 5 H 12 有三种同分异构体
C.
甲烷与氯气在光照条件下能发生取代反应
D.
所有烷烃中均有碳碳单键
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举一反三
【单选题】以下选项中属于下颌神经阻滞术禁忌证的是( )。
A.
下颌神经及其各分支神经分布区域癌痛
B.
下颌神经及其各分支神经分布区域外伤后疼痛
C.
下颌神经及其各分支神经分布区域放疗后疼痛
D.
下颌神经及其各分支神经分布区域疱疹后神经痛
E.
下颌神经及其各分支神经分布区域外伤感染后疼痛
【单选题】There are many clouds coming，it_________ rain soon．
A.
will be
B.
is going to
C.
looks like
D.
likes
【简答题】用 be 的正确形式填空,完成句子。 1. There some brochettes on the grill. 2. there any meat on the skewer? 3. There a cook’s knife in the kitchen. 4. There some carrots in the colander. 5. there a roasting fork in th...
【简答题】There ___ any rice in the bowl. A. are B. is C. isn‘t D. aren’t 2.There ___ many apples on the tree last year. A. have been B. were C. are D. is 3.How many ___ are there in the room? A. apple B. stude...
【简答题】A. Figure out the subject of each sentence. 1. In the doorway stood her father. _______ 2. He had rarely seen such a sunset. ______ 3. Here comes Sandra’s car. _____ B Complete the sentences based on ...
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