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（1）如图是A、B两种固体物质的溶解度曲线： ① p点表示的意义 ； ② t 1 ℃时，两种物质的溶解度由大到小的顺序为 ； ③t 3 ℃时，将45g的A物质加入到50g水中的烧杯中，充分搅拌，得到A溶液的质量为 g。 （2 ）今年世界的主题───水和粮食安全。某校环保小组的同学响应这一主题，对右江河水进行检测。 ①近几年右江河上捞沙船越来越多，造成河水非常浑浊。除去水样中难溶性杂质应进行的操作是 （填字母）； A. 过滤 B. 结晶 C. 蒸发 ②为了保护右江河的水质，下列做法合理的是 （填字母）； A.禁用农药和化肥 B. 抑制水中所有动、植物生长 C.任意排放生活污水 D. 工业废水经过净化后再排放 ③在日常生活中，如果水的硬度大或者病原微生物过多，都可以采取 。
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【单选题】The circuit in Figure 8-1 fails to produce the proper data output. The individual flip-flops are checked with a logic probe and pulser and each checks OK. What is the most likely cause of the problem?
A.
One of the interconnect lines between two stages has a solder bridge to ground.
B.
The data output line is grounded.
C.
One of the flip-flops has a solder bridge between its input and Vcc.
D.
One of the clock input lines is open.
【简答题】ENGINE COOLING CIRLUITS Most marine engines utilize one or more cooling-water circuits. A closed freshwater cooling circuit is always used for cooling the engine jacket water. A second circuit is also...
【判断题】The most important consideration for dust control within a grinding/classification/product storage circuit is dust containment，and the second is dust collection.
A.
正确
B.
错误
【单选题】In computer case, , sometimes called system board, is the largest and most important circuit board.
A.
blackboard
B.
chipboard
C.
motherboard
D.
circuit board
【判断题】For RC circuits, it is most convenient to choose the capacitive voltage; for RL circuit, it is best to choose the inductive current.
A.
正确
B.
错误
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