先张法目前大多用大多用于生产（）
A、屋面板
B、屋架
C、楼板
D、檩条
E、大型吊车梁
参考答案：A, C, D
A hygroscopic cargo is define as a cargo（）.
A.capable of absorbing moisture in the form of a gas
B.capable of giving off moisture in the form of a liquid
C.that is shipped in a liquid stste
D.that will ignite in contact with water
