哪项是错误的高LET特点()
A．直接杀伤比例较高
B．间接杀伤低
C．相对生物效应(RBE)大
D．对剂量改变的影响不显著
E．氧增强比较低
参考答案：B
He coughed day and night. The doctor asked him ______ smoking. [ ]
A. going on
B. giving up
C. to give up
找错误。
( )1．Where is the pens ?
A B C D
( )2. Whats your name ?
( )3. She is my friends
( )4. May I borrow you book?
( )5. I have five marker.
e ?
marker.