保证是债的担保形式之一。
参考答案:对
He was disappointed that his plan did not .
A.go on
B.go off
C.go through
D.go out
在()航行时,船舶操舵装置通常采用自动操舵方式。
A.紧急情况下
B.机动状态下
C.进出港口
D.正常