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【单选题】
TK981型应急电源采用电压输出电路，三相整流电路给负载提供（）供电电压。A.
DC12V
B.
DC24V
C.
DC48V
D.
DC110V
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参考解析：
知识点：
皮皮学刷刷变学霸
举一反三
【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】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。
【单选题】关于单核吞噬细胞系统的特征,错误的是
A.
广泛分布于全身各处
B.
有强的吞噬功能
C.
均起源于骨髓的幼单核细胞
D.
中性粒细胞是该系统的组成成分
E.
破骨细胞是该系统的组成成分
【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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