单项选择题
A.examined；are not having B.had examined；would not have C.had examined；would not have had D.should examine；would not have
We’ve tried many ways, but all in vainOnly in this way,...
单项选择题We’ve tried many ways, but all in vainOnly in this way, （） the problem, I’m sure.
A.can we solve B.we can solve C.we will solve D.can we solved
Let H （） the quantity of heat which has been converted ...
单项选择题Let H （） the quantity of heat which has been converted into mechanical work.
A.represent B.represents C.representing D.being represented
The chief engineer suggests that the second engineer （）...
单项选择题The chief engineer suggests that the second engineer （） a dead line for handing in the work plan.
A.will set B.shall set C.set D.sets
