【简答题】Define the following terms: 1. sociolinguistics
【单选题】In terms of vessel manning,a watch is the ______.
A.
Direct performance of deck or engine operations in a scheduled and fixed rotation
B.
Performance of maintenance work necessary for the vessel's safe operation,on a daily basis
C.
Performance of lookout duties
D.
Direct performance of cargo loading and discharge operations only
【简答题】Define the following terms: 1. idiolect
【单选题】In terms of vessel manning,a watch is the ______.
A.
direct performance of deck or engine operations in a scheduled and fixed rotation
B.
performance of maintenance work necessary for the vessel's safe operation,on a daily basis
C.
performance of lookout duties
D.
direct performance of cargo loading and discharge operations only
【简答题】在花瓶中加入“鲜花保鲜剂”,能延长鲜花的寿命.下表是500mL“鲜花保鲜剂”中含有的成分,阅读后回答下列问题: 成分 质量(g) 摩尔质量(g?mol -1 ) 蔗糖 25.00 342 硫酸钾 0.25 174 阿司匹林(C 9 H 8 O 4 ) 0.17 180 高锰酸钾 0.25 158 硝酸银 0.02 170 (1)配制上述“鲜花保鲜剂”所需的仪器有:烧杯、电子天平、药匙、量筒、___...