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【单选题】
对左旋乳酸和右旋乳酸,下列说法正确的
A.
它们的比旋光度的数值差异很大
B.
在任何条件下，它们表现出来的性质是一致的
C.
它们的比旋光度的数值相同，但旋光方向相反
D.
等量的左旋乳酸和右旋乳酸混合后，构成内消旋体
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参考答案：
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【单选题】---I' m sorry to have kept you waiting. ---Oh, not at all. I___here for only a few minutes.
A.
have been
B.
had been
C.
have come
D.
will be
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【判断题】氧 - 乙炔气割大厚度钢板时 , 应采用大号割炬和割嘴 , 以获得大的火焰能率。
A.
正确
B.
错误
查看完整题目与答案
【单选题】下列哪个选项可以记账
A.
未被审核的凭证
B.
上月未结账
C.
试算不平衡
D.
本月有未记录的业务
查看完整题目与答案
【判断题】整车、零担运价，一次托运货物的计费重量达3吨以上的，按整车运价计费，不足3吨的按零担计费；普通货物分等运价，《汽车货物运输规则》对普通货物分为三等。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: I am sorry. I have to leave a bit early. I have an important appointment with my doctor. W: That's fine with me. But you'd better tell the manager. Q: What is the possible relationship between...
A.
Teacher and student.
B.
Doctor and patient.
C.
Coworkers in an office.
D.
Manager and employee.
查看完整题目与答案
【单选题】---I ‟ m sorry to have kept you waiting long. ---Never mind. I ____ here for only a few minutes.
A.
have been
B.
have come
C.
have arrived
D.
waited
查看完整题目与答案
【单选题】I ’ m sorry to have to say this, ____ you forgot to turn off the lights when you left the room last night.
A.
and
B.
but
C.
so
D.
because
查看完整题目与答案
【单选题】汉字可以记录语素和音节,下列哪个选项是音节
A.
“葡”
B.
“人”
C.
“笑”
D.
“我”
查看完整题目与答案
【判断题】氧-乙炔气割大厚度钢板时,应采用大号割炬和割嘴,以获得大的火焰能率。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: I'm sorry to have kept you waiting for such a long time. I didn't think the meeting would be so long. W: That's all right, Dr, Green. I've got the data you required and a few reference books w...
A.
To remind him of the data he should take to the conference,
B.
To see if he is ready for the coming conference.
C.
To tell him something about the conference.
D.
To help him prepare for the conference.
查看完整题目与答案
相关题目：
【单选题】---I' m sorry to have kept you waiting. ---Oh, not at all. I___here for only a few minutes.
A.
have been
B.
had been
C.
have come
D.
will be
查看完整题目与答案
【判断题】氧 - 乙炔气割大厚度钢板时 , 应采用大号割炬和割嘴 , 以获得大的火焰能率。
A.
正确
B.
错误
查看完整题目与答案
【单选题】下列哪个选项可以记账
A.
未被审核的凭证
B.
上月未结账
C.
试算不平衡
D.
本月有未记录的业务
查看完整题目与答案
【判断题】整车、零担运价，一次托运货物的计费重量达3吨以上的，按整车运价计费，不足3吨的按零担计费；普通货物分等运价，《汽车货物运输规则》对普通货物分为三等。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: I am sorry. I have to leave a bit early. I have an important appointment with my doctor. W: That's fine with me. But you'd better tell the manager. Q: What is the possible relationship between...
A.
Teacher and student.
B.
Doctor and patient.
C.
Coworkers in an office.
D.
Manager and employee.
查看完整题目与答案
【单选题】---I ‟ m sorry to have kept you waiting long. ---Never mind. I ____ here for only a few minutes.
A.
have been
B.
have come
C.
have arrived
D.
waited
查看完整题目与答案
【单选题】I ’ m sorry to have to say this, ____ you forgot to turn off the lights when you left the room last night.
A.
and
B.
but
C.
so
D.
because
查看完整题目与答案
【单选题】汉字可以记录语素和音节,下列哪个选项是音节
A.
“葡”
B.
“人”
C.
“笑”
D.
“我”
查看完整题目与答案
【判断题】氧-乙炔气割大厚度钢板时,应采用大号割炬和割嘴,以获得大的火焰能率。
A.
正确
B.
错误
查看完整题目与答案
【单选题】听力原文：M: I'm sorry to have kept you waiting for such a long time. I didn't think the meeting would be so long. W: That's all right, Dr, Green. I've got the data you required and a few reference books w...
A.
To remind him of the data he should take to the conference,
B.
To see if he is ready for the coming conference.
C.
To tell him something about the conference.
D.
To help him prepare for the conference.
查看完整题目与答案
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