生态位机遇假说人为,()综合决定外来入侵的增长概率。
A.资源、天敌、繁殖能力
B.资源、天敌、物理环境
C.资源、结构、繁殖能力
D.资源、结构、物理环境
参考答案:B
(2014年(春)重庆市高三考前冲刺测试卷)2. For many, winning remains __ dream, but they continue trying their luck as there're always __ chances that they might succeed.
A./; /
B.a; the
C.a; /
D.the; the
集流环内炭刷与铜环的接触电阻应小于0.5Ω。()