文化遗产地的破坏力主要来自于人为因素及自然因素,其中人为因素的破坏是列入《濒危世界遗产名录》的主因。它们的破坏力来自两个方面?
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Because Edgar was convinced of the accuracy of this fact,he__________ his opinion.
A. struck at
B. strove for
C. stuck to
D. stood for
The designing of a satellite in the heavenly environment is not absolutely an easy job.
A. by all means
B. by any means
C. by every means
D. by no means
在实际统计工作中,为了消除季节变动的影响,常计算( )。
A. 年距增长量
B. 逐期增长量
C. 累计增长量
D. 平均增长量