【判断题】气动压力控制阀都是利用作用于阀芯上的流体空气压力和弹簧力相平衡的原理来进行工作。
【判断题】Part 3 True or False (3*10'=30') 将" 痛苦纠聚心中,眉心发烫发热,胸口郁闷难展"翻译为 "A strong feeling of pain was full of her heart, with something burning between her eyebrows and her chest depressed."从语义忠实、表达通顺角度上说是可以接受的译...
【判断题】气动压力控阀都是利用作用于阀芯上的流体(空气)压力和弹簧力相平衡的原理来进行工作的。
【判断题】将 “痛苦纠聚心中,眉心发烫发热,胸口郁闷难展,胃里一股气冲喉而上。”翻译成“Pain was accumulating in her heart, she felt very hot in her eyebrows, a puff of air from her stomach came to her throat, her choked with great depression...
【单选题】在已有的student表中,如果要将学号字段设置为主键,可使用()命令
A.
alter table student drop primary key;
B.
alter table student modify stuNo char primary key;
C.
alter table student modify stuNo primary key;
D.
alter table student modify stuNo char(10) primary key;
【判断题】监理在批准延期前,必须进行延期评估。依据申请资料真实,合同依据准确,延期理由充分。
【单选题】设置为主键(primary key)的字段( )