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听力原文: The United States trade deficit widened bringing the gap for last year to a record high of more than 725 billion dollars. The Commerce Department reported that the gap between what America sells abroad and what it imports rose by more. than 65 billion dollars in December. It's 15 years since the US was somewhere close to selling as much overseas as it buys from abroad. But the concern about the size of the trade deficit has grown in the last few years. Last year it was equivalent to 5.8 percent of total US national income. It's a problem politically be cause many members of Congress regard it as a sign that American jobs are being lost to other countries. The point was underlined by the especially contentious bilateral deficit with some Asian countries. Which of the following statements about the US trade is TRUE?
A.
The gap between its import and export narrowed.
B.
The Commerce Department shows great concern.
C.
What it imports has outnumbered what it exports.
D.
Only the government concerns about the trade deficit.
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参考答案:
举一反三
【多选题】透析用水生物污染物超标的常见问题及处理方法( )
A.
未进行有效消毒:检测透析用水细菌数>50CFU/ml,或内毒素>0.125 EU/ml 时,应进行水处理系统完整消毒。
B.
反渗透膜密封件泄漏:检查更换密封件。
C.
反渗透膜破损:更换反渗透膜。
【判断题】依附型的医疗急救模式有院前急救,但没有院内救治。
A.
正确
B.
错误
【单选题】蒜黄生长主要是利用母瓣中的养分,做蒜黄栽培的蒜种最好选用(      )。
A.
大瓣蒜
B.
小瓣蒜
C.
独头蒜
D.
散瓣蒜
【判断题】2500+的S16长距光板采用PIN管,短距光板采用APD管,前者的接收机灵敏度比后者的接收机灵敏度小,但发光功率指标一样。()
A.
正确
B.
错误
【单选题】煮沸灭菌时,为提高沸点到105℃,可在水中加入
A.
1%~2%碳酸氢钾
B.
1%~2%碳酸氢钠
C.
1%~2%碳酸钙
D.
0.5%亚硝酸钠
E.
11.8%乳酸钠
【多选题】工业用水处理方法中表述正确的是?
A.
软化是指去除水中的钙镁等离子。
B.
除盐是指去除水中的阴阳离子。
C.
淡化是指降低水中的阴阳离子浓度。
D.
常用的方法有蒸馏法、离子交换法、电渗析法及反渗透法。
【单选题】下面关于光接收机的描述,正确的是()。
A.
APD接收机灵敏度比PIN接收机低
B.
PIN接收机灵敏度比APD接收机低
C.
APD接收机过载点比PIN接收机高
【简答题】The police fily c the thief.
【多选题】透析用水处理方法有______。
A.
蒸馏法
B.
电渗析发
C.
水软化
D.
RO水处理
【单选题】关于光接收机,下列说法错误的是
A.
光接收机主要选用两种PIN和APD
B.
光接收机的动态范围越大越好
C.
自动增益控制(AGC)是控制主放大器的增益
D.
APD灵敏度比PIN差
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