在△ABC中，A＝45°，AC＝4，AB＝$\sqrt{2}$，那么cosB＝（    ）

    It was a playground. Eight ____(child) were standing on the starting line to take part in a running race.

    Ready? Bang!

    All eight girls started running ____ they heard the sound. After a minute, one of the small girls fell down. Because ____the pain(痛), she started to cry. When the other seven girls heard, they stopped running ____(quick).Then they stood for a while to see what happened. They decided ____(run) back to the place where the girl fell down. One of them kissed the girl and told ____ to be strong. They said, “We will be together ____ you.” Then, seven girls helped the fallen girl stand up and looked after her carefully. The eight girls joined hands together, walked together and ____(get) to the winning line. People were moved. Clapping(掌声) of ____(hundred) of people came out. Though they lost the race, they were all ____best runners!

    All these special girls are strong and brave. What did they teach this world？Teamwork! Friendship! Love!：

下列选项不能体现自强精神的是（   ） 

如图，T₁、T₂是监测交流高压输电参数的互感器，其中a、b是交流电压表或交流电流表．若高压输电线间的电压为220kV，T₁的原、线圈匝数比为1：100，交流电压表的示数为100V，交流电流表的示数为1A，则（   ）

已知a、b、c三种物质的溶解度曲线如图1，根据题意回答下列问题．

（1）下列说法中，正确的是____ ．

A．a与b相比，a的溶解度大于b的溶解度

B．在t₁℃时，a与b的溶解度相等

C．t₂℃时，将30g a物质溶于50g溶剂中，可得到80g溶液

D．从t₂℃降温至t₁℃时，c有晶体析出

（2）如图2所示，将盛有c物质饱和溶液的试管置于盛有适量水的烧杯中，需向烧杯内加入下列哪种物质，才能使试管内的饱和溶液变为不饱和溶液____ 

A．浓H₂SO₄   B．氢氧化钠    C．蔗糖    D．食盐    E．硝酸铵．