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【单选题】
已知集合 , ,若A∩B=B,则 =(     ).
A.
- 或1
B.
2或-1
C.
-2或1或0
D.
- 或1或0
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参考答案:
举一反三
【单选题】胰脂肪酶对脂肪的分解需要哪种酶的帮助( )
A.
肠激酶
B.
辅酯酶
C.
磷脂酶
D.
胆固醇酯酶
E.
羧基肽酶
【简答题】The new office opens ________ 30th March.2. All of our shops are open ________ night.3. Can we have a meeting ________ Friday?4. We always have our sales conference ________ July.5. We don't schedule ...
【单选题】胰脂肪酶对脂肪的分解需要哪种酶的帮助()
A.
肠激酶
B.
辅酯酶
C.
磷脂酶
D.
胆固醇酯酶
【单选题】There are no bunks for sleeping,just a nice,comfortable cushioned seat.The carriages are clean and roomy.What type of train ticket does this sentence refer to ?
A.
Hard sleeper
B.
soft seat
C.
hard seat
D.
soft sleeper
【单选题】“There are no bunks for sleeping, just a nice, comfortable cushioned seat. The carriages are clean and roomy.” What type of train ticket does this sentence refer to? ( )
A.
hard sleeper
B.
soft sleeper
C.
hard seat
D.
soft seat
【单选题】酪氨酸经代谢可产生乙酰乙酸和延胡索酸,它属于下列哪类氨基酸
A.
生糖氨基酸
B.
生酮氨基酸
C.
生糖兼生酮氨基酸
D.
酸性氨基酸
E.
碱性氨基酸
【单选题】差动液压缸,若使其往返速度相等,则活塞直径应为活塞杆直径的
A.
l倍
B.
2倍
C.
2倍
【单选题】there are no bunks for sleeping,just a nice,comfortable cushioned seat.The carriages are clean and roomy.what type of train ticket does this sentence refer to ?
A.
Hard sleeper
B.
soft seat
C.
hard seat
D.
soft seat
【简答题】根据所给提示写出单词。 1. Sometimes we _____ food at home. (煮) 2. Mike often _____ (have) a picnic outside on weekends. 3. Do you have a _____ (健康) lifestyle? 4. There _____ (be)some milk in the cup. 5. We often...
【单选题】"There are no bunks for sleeping, just a nice, comfortable cushioned seat. The carriages are clean and roomy." What type of train ticket does this sentence refer to?
A.
Hard sleeper
B.
Soft sleeper
C.
Hard seat
D.
Soft seat
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