马氏体都是硬而脆的相。
参考答案：对
I don’t doubt _____ for the journey by doing jobs on the ship.
A．that he can pay
B．whether he can pay
C．that can he pay
D．whether can he pay
在计算项目投资的经营成本时，需要考虑筹资方案的影响。 ( )
