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【判断题】
排烟防火阀适用于排烟系统管道上或风机吸入口处,平时处于关闭状态,需要排烟时,可自动开启排烟。当管道气流温度达到70°C时,阀门关闭,防止火灾蔓延。
A.
正确
B.
错误
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【简答题】下列做法中不利于金属资源的保护的是(  ) A.防止锈蚀 B.大量开采金属矿物 C.回收废旧金属 D.寻找金属代用品
【简答题】已知等差数列{a n }的前四项的和为60,第二项与第四项的和为34,等比数列{b n }的前四项的和为120,第二项与第四项的和为90, (Ⅰ)求数列{a n },{b n }的通项公式; (Ⅱ)设 ,则数列{c n }中的每一项是否都是数列{a n }中的项,给出你的结论,并说明理由.
【简答题】四边形的内角和为______;多边形的外角和为______.
【简答题】说明单核吞噬细胞系统的组成及其机能。
【简答题】我国规定的安全色为____、__、__和___四种。对比色为___和___两种。
【单选题】An asset created by prepayment of an expense is:
A.
Recorded as a debit to an unearned revenue account.
B.
Recorded as a credit to a prepaid expense account.
C.
Recorded as a credit to an unearned revenue account.
D.
Recorded as a debit to a prepaid expense account.
E.
Not recorded in the accounting records until the earnings process is complete.
【多选题】关于细菌大小的说法正确的有
A.
一般以微米为单位进行描述
B.
球菌的大小一般以直径来形容
C.
杆菌的大小一般以宽×长来进行描述
D.
螺旋菌的长度以螺旋菌菌体两端点的距离来进行描述
【单选题】An asset created by prepayment of an expense is____________.
A.
recorded as a debit to an unearned revenue account
B.
recorded as a debit to a prepaid expense account
C.
recorded as a credit to an unearned revenue account
D.
recorded as a credit to a prepaid expense account
E.
not recorded in the accounting records until the earnings process is complete
【简答题】如图,分别以四边形ABCD的四个顶点为圆心,以3为半径画弧,则图中四个阴影部分面积和为______.
【简答题】四边形的外角和为(    )。
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