煤的主要特性是指()()()()()等。
参考答案:煤的发热量;挥发份;焦结性;灰的熔融性;可磨性
下列哪项不是仰卧位治疗的优点是()
A.体位舒适宜于接受
B.摆位方便,精确
C.摆位重复性,一致性好
D.节省设备,提高效益
E.适合多种照射技术
The cargo must be shipped directly to China,that is.( )is not allowed.
A.partial shipment
B.transshipment
C.through shipment
D.total shipment