I'm late, but I ______ on time tomorrow. [ ]
A. came
B. come
C. will come
D. have come
答案:C
A.血型与饮食
B.血型与性格
C.血型与减肥
D.血型与运动
两台型号相同的离心泵并联的总效率()单台泵的效率。
A.小于
B.大于
C.等于
D.两倍于