题目内容

脱氢酶指示反应检测波长是？

A. 340nm
B. 380nm
C. 500nm
D. 560nm

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代谢物酶法测定中平衡法的关键是

A. 如何使酶促反应成为零级反应
B. 如何使酶促反应成为一级反应
C. 监测几个点
D. 确定达到终点所需的时间

Today's young people can't live without smart phones. They keep their hands on the phoneswhenever they go, even while they meals .

A. had
B. Will have
C. are having
D. were having

-- a good time we had at the party last night! Yes. It was exciting that l would never forget it.

A. What; such an
B. How; such an
C. How; so
D. What; so

Lots of people exercise every morning bad weather stops them.

A. if
B. unless
C. until
D. since