Cargo handling unit is rated according to the （） to be lifted. ["cargo crane","jib","safe working load","oil pressure"]
调频波参数mf的物理含义是（）。 ["最大（角）频偏与调制信号（角）频率的比值","调制信号振幅与载波振幅之比","调频波的最小频率与最大频率之比倍频器","调制波的最大相移"]
弁償读音正确的是（） ["べんり","べんしょう","べんしょ","べんとう"]
CD-ROM在存储方面（）。 ["仅能存储声音","仅能存储图像","能存储文字、声音和图像","仅能存储文字"]
A charterer is unable to complete the loading of a vessel during the lay days specified in the charter party. Under these circumstances，the（）. ["vessel operator can collect demurrage","ship is authorized extra time to discharge the cargo","charterer must pay dispatch money","effective period of the charter is extended"]
简述车轮虫病的危害。
