对人与自然的关系认识正确的是[ ]
A.人与自然是相互对立的
B.人是自然界的一部分
C.人能够任意主宰自然界
D.人类要先服从于自然界
答案:B
Professor Lee's book will show you how you have observed that can be used in other contexts.
A.that you have observed
B.that how you have observed
C.how that you have observed
D.how what you have observed
以下对测试前校准,正确的是()。
A、提高线缆性能
B、保证测试结果的正确
C、避免测试结果出现数值错误
D、测试前的校准可有可无