题型:填空题 — ____ you work out the math problem?— No, I _____.[ ]A. Do, can't B. Can, mustn't C. Can, can't D. Can't, must 查看答案
题型:填空题 经计算某泵的扬程是30m,流量10m3/h,选择下列某泵最合适()。A、扬程32m,流量12.5m3/hB、扬程35m,流量7.5m3/hC、扬程24m,流量15m3/hD、扬程35m,流量15m3/h 查看答案