单项选择题

The strongest of the natural fibers is（）.

A.cotton
B.hemp
C.manila
D.sisal

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单项选择题

The spray of water in low-velocity fog will have（）.

A.greater range than high-velocity fog
B.lesser range than high-velocity fog
C.about the same range as high-velocity fog
D.greater range than a solid stream

单项选择题

The splice designed to pass easily through a block is called a(n)（）.

A.eye splice
B.short splice
C.long splice
D.block splice