1. [单选题]采用多支承点适合于( )。
A. 平衡舵
B. 不平衡舵
C. 半平衡舵
D. 悬挂舵
2. [单选题]The spur geared mooring winches have advantages over worm geared ones in .
A. higher efficiency of the gear train while reversing
B. the higher gear ratio
C. the multi-start feature
D. higher recovering speed
3. [单选题]波纹管在安装到仪表上时,往往采取预压缩的措施,其目的是( )。
A. 提高线性度和线性范围
B. 增加波纹管的强度
C. 减小波纹管的滞后性
D. 降低波纹管的刚度