脑干肿瘤放疗,应在肿瘤外缘外放()。
A.0.5cm
B.1.0cm
C.1.5cm
D.2.0cm
E.2.5cm
参考答案:B
某同学用托盘天平称取2.5克食盐时,发现指针向左偏转,此时他应该( )
A.增加砝码
B.减少砝码
C.增加食盐
D.减少食盐
I was deeply impressed ________ the speech by the mayor of Shanghai before the final voting for EXPO 2010.
A.to
B.on
C.over
D.with