低碳钢不能用来制造工作温度大于_________℃的容器等设备。
A.300
B.400
C.500
D.600
参考答案：B
-Sandy,I called you at 9:00 last night,but nobody answered the phone.
-I’m sorry. We ______ a birthday party _______ Jerry.
A．had;with
B．were having;for
C．are having;for
D．had;for
叶酸缺乏引起的巨幼细胞性贫血患者治疗前，红细胞直方图表现为（）
A.波峰右移、峰底变宽
B.波峰左移、峰底变宽
C.波峰右移、峰底不变
D.波峰左移、峰底不变
E.直方图不变
