开放性击
参考答案:
拍面朝向迎面而来的球,称为「open」,反之称为「closed」。
SDH映射单元中,虚容器VC-4的基帧结构为()。
A.4*(9*4-1);
B.4*(9*12-1);
C.9*85;
D.9*261。
Questions 6~10
What does the passage mainly discuss ______
A. Teenagers need much more sleep than they actually have now.B. The schedule of teenagers should be made different from that of adults.C. Starting the first class late is advantageous in more than one way.D. Unanticipated problems will arise from the postponement of the first class.