熔炼炉渣线部位应选用（）性良好的耐火材料。
A.热稳定
B.抗冲击
C.高温抗渣
D.透气
参考答案：C
It is the best for this kind of plant to grow in ______ is warm and rainy.
A．that
B．what
C．which
D．where
小儿急腹症常见的有
A．肠套叠
B．急性阑尾炎
C．钳闭性腹股沟疝
D．胃溃疡出血
E．粘连性肠梗阻
