柑桔嫁接的方法主要有()。
A、切接
B、芽接
C、腹接
D、靠接
参考答案:A, B, C
Bolt broke his own record _____ at the 2008 Beijing Olympics by 9.58 seconds in Berlin.
[ ]
A. to set
B. setting
C. set
D. having set
确诊后,其临床期别为()。
A.Ⅰa期
B.Ⅰb1期
C.Ⅰb2期
D.Ⅱa期
E.Ⅱb期