无线电波从发射端到接收端的传播方式有()。
A.视距传播
B.地波传播
C.对流层散射传播
D.电离层传播
参考答案:A, B, C, D
The two families have_______their disagreements out of court in a friendly way,and this is
what all of us expected to see.(西城区)
A.settled
B.solved
C.defeated
D.overcame
优秀运动员每百毫升血中的血红蛋白量为:()。