“见肝之病，知肝传脾”是指（）
A．木乘土
B．木克土
C．土侮木
D．子病及母
E．母病及子
参考答案：A
The majority of the damage _____ easy to repair. [ ]
a. is
b. are
c. were
d. be
粗乙炔气清净的目的在于除掉硫化氢和磷化氢两种主要杂质。
