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单项选择题

已知RLC串联谐振电路，已知L=2mH，发生谐振的角频率ω0=1000rad/s，则电容C=_____μF。
A、1/2
B、50
C、200
D、500

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单项选择题
Not many years ago, a wealthy and rather strange old man named Johnson lived alone in a village in the south of England. He had made a lot of money in trading with foreign countries. When he was seventy-five, he gave ~ 1200 to the village school to buy land and equipment for a children′ s playground.
As a result of his kindness, many people came to visit him. Among them was a newspaperman.
During their talk, Johnson remarked that he was seventy-five and expected to live to be a hundred. The newspaperman asked him how he managed to be healthy at seventy-five. Johnson had a sense of humour (幽默). He liked whisky (威士忌酒) and drank some each day. "I have an injection(注射) in my neck each evening," he told the newspaperman, thinking of his evening glass of whisky.
The newspaperman did not understand what Johnson meant. In his newspaper he reported that Johnson was seventy-five and had a daily injection in his neck. Within a week Johnson received thou- sands of letters from all over Britain, asking him for the secret of his daily injection.
The gift of money to the school suggests that Johnson .
A.hadnochildren
B.wasastrangeman
C.wasveryfondofchildren
D.wantedpeopletoknowhowrichhewas
单项选择题
下列关于阻塞等待方法wait()的描述中，错误的是（   ）。
A．调用wait()方法，当前线程会释放对象锁
B．调用wait()方法，进入阻塞状态的当前线程会在休眠一定时间后自动恢复运行
C．阻塞等待方法wait()只能在同步方法或同步语句中调用
D．调用wait()方法，当前线程会进入阻塞状态
单项选择题
某工程位于平均相对湿度大于60%的一类环境下，其钢筋混凝土次梁(以受弯为主)的裂缝控制等级和最大裂缝宽度限值宜取的选项是( )。
A.三级，0.2mm
B.三级，0.3mm
C.三级，0.4mm
D.二级，0.2mm
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