桑苗种后怎样管理?
参考答案:
种后20天左右,桑芽长至2—3片叶时施催芽肥,以施腐熟人粪尿或复合肥等速效性氮肥为主,每半个月追肥一次,每担稀粪水加1—2两尿素淋施。
They've won their last three matches, ______ I find a bit surprising actually. [ ]
A. that
B. when
C. what
D. which
用电压表测量电压时,必须与被测电路串联,用电流表测量电流时,必须与被测电路并联