切西瓜时流出的汁液是[ ]
A.水
B.细胞液
C.细胞质
D.糖水
B
In order to perform the monitor function, language learners have to satisfy at least three conditions. One of the conditions is ______ to monitor his production.
A. enough speech B. much informationC. sufficient material D. sufficient time
()不属于锅炉内部检验的内容。
A、膨胀情况的抽查
B、锅炉密封、绝热情况的抽查
C、水(介)质处理情况的抽查
D、锅炉安全管理制度及其执行情况的抽查