【多选题】下列各项中属于统计人员职责职权的是统计人员( )。
C.
进行统计调查时,有权就与统计有关问题询问有关人员
D.
应当具备与其从事的统计工作相适应的专业知识和业务能力
【简答题】请计算,整流滤波电路中,估算的输入与输出电压之间的比值。
【单选题】【单选】What is the main purpose of dunnage?
A.
To act as ballast for light vessels
B.
To provide ventilation and drainage for cargo
C.
To secure the tarpaulins in place
D.
To support weakened bulkheads
【单选题】S1:Have you laid the dunnage as instructed?S2:I think so.S1:What have you done with the bilges?S2:The bilges have been covered with planks.S1:Where did you find the dunnage planks? The planks you use ...
A.
It should be laid with one layer of dunnage.
B.
It should be laid with two layer of dunnage.
C.
It should be laid with one layer of mats.
D.
It should be laid with two layer of dunnage.
【单选题】What is the main purpose of dunnage? ___ .
A.
To act as ballast for light vessels
B.
To provide ventilation and drainage for cargo
C.
To secure the tarpaulins in place
D.
To support weakened bulkheads
【多选题】预应力砼按工艺分有: 、 和 预应力三类。