爆压后出现(),应开断重接。
A、连接管表面有穿孔、裂纹及明显凸肚者;
B、管外导、地线有轻微烧伤者;
C、连接管表面有轻微烧伤者;
D、具有上面三种情况之一者。
参考答案:A
钢筋的除锈是为了保证钢筋与混凝土之间有足够的黏结力。( )
Many Chinese students think science subjects are foreign languages.
A.more difficult as
B.less difficult than
C.much difficult than
D.so difficult as