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氮芥类抗肿瘤药物是如何发展而来的？其结构是如何组成的？并简述各部分的主要作用。

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什么是生物电子等排原理？试举2个系列加以说明

Ilearnpaintingnextsummerholiday.

A. amgoingto
B. isgoingto
C. was
D. goingto

Close the door of fear behind you, and youthe door of faith open before you.

A. saw
B. have seen
C. will see
D. are seeing

—— you go to the museum after school?—— Yes, I will.

Are
B. Do
C. Will
D. May