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【多选题】
可以采用哪些措施来缩短延滞期?
A.
适当的加大接种量
B.
采用对数期的种子
C.
调整培养基的成分
D.
采用繁殖较快的菌种
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举一反三
【单选题】It was such a pity that she thew her chance of happiness.
A.
a t
B.
back
C.
in
D.
away
【单选题】听力原文:M: Hello, Julia. Why are you in such a hurry? W :Hello, Peter. I' m going to the theatre. They say there’s a lecture on how to improve the skills of listening. Do you want to go with me? M: Oh, n...
A.
he's very busy
B.
the traffic is busy
C.
he has already heard it
【判断题】车床的主运动即主轴的旋转运动。A. √ B. ×
A.
正确
B.
错误
【单选题】车床的主运动即主轴的旋转运动,它是以 ( ) 为动力,经皮带轮传递到主轴变速箱
A.
电动机
B.
发动机
C.
柴油机
D.
蒸汽机
【单选题】车床的主运动即主轴的旋转运动,它是以电动机为动力,经()传递到主轴变速箱。
A.
进给箱
B.
主轴箱
C.
皮带轮
D.
溜板箱
【单选题】方程y′′+2y′=2x2−1y″+2y′=2x2−1的一个特解形如
A.
y = a x 3 + b x 2 + c x + d " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 3 + b x 2 + c x + d y=ax3+bx2+cx+d ;
B.
y = a x 2 + b x + c " role="presentation" style="display: inline-block; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 2 + b x + c y=ax2+bx+c ;
C.
y = a x 4 + b x 3 + c x 2 + d x + e " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 4 + b x 3 + c x 2 + d x + e y=ax4+bx3+cx2+dx+e ;
D.
y = a x + b " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x + b y=ax+b
【判断题】( )车床的主运动即主轴的旋转运动。
A.
正确
B.
错误
【单选题】车床的主运动即主轴的旋转运动。它是以()为动力,经皮带传递到主轴变速箱。
A.
电动机
B.
发动机
C.
柴油机
D.
蒸汽机
【单选题】铜生产企业利用铜期货进行卖出套期保值的情形是()
A.
以固定价格签订了远期铜销售合同
B.
有大量铜库存尚未出售
C.
铜精矿产大幅上涨
D.
铜现货价格远高于期货价格
【单选题】下面的利用哪种方式CSS的优先级最高。
A.
浏览器默认的样式
B.
内嵌式
C.
链入式
D.
行内式
相关题目:
【单选题】方程y′′+2y′=2x2−1y″+2y′=2x2−1的一个特解形如
A.
y = a x 3 + b x 2 + c x + d " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 3 + b x 2 + c x + d y=ax3+bx2+cx+d ;
B.
y = a x 2 + b x + c " role="presentation" style="display: inline-block; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 2 + b x + c y=ax2+bx+c ;
C.
y = a x 4 + b x 3 + c x 2 + d x + e " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x 4 + b x 3 + c x 2 + d x + e y=ax4+bx3+cx2+dx+e ;
D.
y = a x + b " role="presentation" style="display: inline-table; line-height: 0; font-size: 19.52px; overflow-wrap: normal; float: none; direction: ltr; max-width: none; max-height: none; min-width: 0px; min-height: 0px; border: 0px; margin: 0px; padding: 1px 0px; color: rgb(0, 0, 0); font-family: "Microsoft YaHei"; position: relative;" > y = a x + b y=ax+b