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【多选题】
下列关于萜类化合物挥发性叙述错误的是A.
所有非苷类单萜及倍半萜具挥发性
B.
所有单萜苷及倍半萜苷不具挥发性
C.
所有非苷类二萜不具挥发性
D.
所有二萜苷不具挥发性
E.
所有二萜及以上不能随着水真气蒸馏
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【简答题】用 for 或 since 完成下列句子。 1. We have known each other _______ tenyears. 2. He has learnt about 2,000 Englishwords _______ he went to school. 3. I have known him _______ three monthsago. 4. She has been aw...
【简答题】所有账户的左边均记录增加额，右边均记录减少额。 （ ）
【简答题】请选用for或since填空 1._________2000 2._________ half an hour 3._________ I was born 4._________ half an hour ago 5._________last month 6._________ eight o’clock 二.用for/since将句子补充完整 1. He has lived in Zhenj...
【简答题】所有账户的左边均记录增加额，右边均记录减少额。( )
【简答题】B. 用 since 或 for 1) We have learned five lessons _ _ __ _ the beginning of this term. 2) Mrs Liao has been in hospital __ _ ___ last week. 3) I have stayed at my aunt’s __ _ __two weeks.
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