挫折-侵犯理论认为,侵犯强度同目标受阻强度之间是()的关系。
A.正相关
B.负相关
C.零相关
D.很复杂
参考答案:A
The development of industry has been ____ gradual process throughout ______human existence, from stone tools to modern technology.
A./, the
B.the, a
C.a, /
D.a, a
精子的产生部位是()
A.直精小管
B.生精小管
C.睾丸网
D.睾丸间质
E.附睾