疼痛伴有沉重之感，是因（）
A.气机阻滞
B.寒邪凝滞
C.瘀血阻滞
D.湿邪困阻
E.火邪窜络
参考答案：D
The argument remains extremely heated ______ it is worthwhile for China to open its door to foreign cars.
A．that
B．which
C．if
D．whether
某气体流经内径为300mm的管线，其体积流量为1876m3/h，则气体在管内流速为（）m/s。
A.1.844
B.3.688
C.11.064
D.7.376
