药物一级反应半衰期的公式是A．t1/2=0.693/kB．t1/2=Co/2kC．t_爱下问搜题

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问题单项选择题

药物一级反应半衰期的公式是

A．t1/2=0.693/k
B．t1/2=Co/2k
C．t1/2=0.1054/k
D．t1/2=0.693k
E．t1/2=l/Cok

答案

参考答案：A

完形填空

完型填空。

     I am Taotao. I have   1   friends, they   2   Bob, Wang Hai and Lynn. Wang Hai is 1.70 metres(米)
  3   . He has short, black hair and   4   eyes are black. Bob has brown hair and his eyes are black,   5   .
Lynn is   6   the U.S.A. She is 1.62 metres tall. She   7   long blond hair. Look   8   her eyes, they are
blue. She   9   very pretty(漂亮).We often study and play games together(一起).   10   are good friends.

( ) 1. A. one
( ) 2. A. do
( ) 3. A. long
( ) 4. A. his
( ) 5. A. too
( ) 6. A. to
( ) 7. A. has
( ) 8. A. /
( ) 9. A. finds
( ) 10.A. Us

B. two
B. am
B. tall
B. her
B. and
B. from
B. have
B. to
B. comes
B. We

C. three
C. is
C. short
C. my
C. to
C. at
C. is
C. at
C. has
C. Our

D. four
D. are
D. big
D. your
D. so
D. on
D. does
D. in
D. looks
D. Ours

单项选择题

天然景观中，斑块面积大，主要由（）组成的。

A、环境资源斑块和干扰斑块

B、引入斑块和残余斑块

C、环境资源斑块和引入斑块

D、干扰斑块和残余斑块