按运输对象划分，班轮航线可分为普通杂货航线、()和客运航线。
A．干散货航线
B．液体货航线
C．集装箱航线
D．冷藏货航线
参考答案：C
如图所示，一根长为的细绳一端固定在O点，另一端悬挂质量为的小球A，对小球施加一作用力使其受力平衡，且使细绳与竖直方向成30o角，则对小球施加的力的最小值等于
A．
B．
C．
D．
Multipurpose Internet Mail Extension (MIME) is a (71) document messaging standard in the Internet enviroment, with MIME, users can send (72) Email messages that include audio, video, graphices, and text to any other user of a TCP/IP network. Richtext information can also be (73) into messages. It defines the fonts, formats, and (74) features of a document so the document can be easily (75) on many different types of systems.
A．color
B．size
C．design
D．layout
