飞机结构按承力情况可分为:().
A.铝合金、钢、钛合金、或各种复合材料结构
B.纵梁、桁条、肋、隔框等结构
C.主要结构和次要结构
D.承压结构和承拉结构
参考答案:C
—What do you think of modern music?
—It is often considered not as good as ________ of the past.
A.it
B.that
C.this
D.one
在Flash中支持的声音格式有()。
A、MP3
B、WAV
C、RAW
D、MIDI