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变量分为内部变量和() 是PLC定义的存储单元的映像,其值随PLC的程序执行而改变,如启停、急停、复位、手动自动切换等

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It is very strange that whenever Brian does anything unexpected, his wife can always ascribe his behaviorthe external environment and sometimes to destiny.

A. to
B. at
C. under
D. in

Until its eventual collapsethe weight of accumulated economic pressures, the system operated successfully for almost over 20 years.

A. out
B. in
C. over
D. under

Feelings, emotions, and desires must subordinate themselves reason because they sometimes could be irrational and biased.

A. at
B. to
C. in
D. over

下列哪种密码不编码氨基酸： ()。

A. 起始密码子
B. 色氨酸密码子
C. 甘氨酸密码子
D. 终止密码子