由于（）致使钢板产生边裂。
A.板坯边缘出现角裂、过烧、气泡暴露
B.含磷偏高
C.加热时间不足
D.压下量过大
参考答案：A
Because Edgar was convinced of the accuracy of this fact,he his opinion.
A．struck at
B．strove for
C．stuck to
D．stood for
为方便旅客的旅行生活，限量携带初生雏（）只。
