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【多选题】
下列正确的是：()A.
水泥砂浆水泥用量可按《建筑砂浆配合比设计规程》JGJ98—2000直接查表确定。
B.
当一组六个砂浆试件的最大值或最小值与平均值的差超过15%时，以中间四个试件的平均值作为该组试件的抗压强度值。
C.
通常，水泥混合砂浆用水量小于水泥砂浆的用水量
D.
1m干燥状态的砂子的堆积密度值，就是1m砂浆所用的干砂用量
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【判断题】他不幸患上了癌症,更糟的是他没有足够的钱去治疗。 Unfortunately he developed lung cancer. To make matters worse he didn’t have enough money for treatment. ( )
A.
正确
B.
错误
【单选题】世界贸易组织的《服务贸易总协定》没有对服务贸易下定义，而是规定了服务贸易的几种方式，下列哪项属于《服务贸易总协定》服务贸易方式中的商业存在？（）
A.
从一国境内直接向其他国境内提供服务
B.
从一国境内向其他国的服务消费者提供服务
C.
外国实体在另一国境内设立附属公司或分支机构并提供服务
D.
一国的服务提供商通过自然人到其他国境内提供服务
【简答题】用适当的介词填空. 1. He goes back ___ Sunday morning. 2. He goes________ No. 5 Middle School. 3. I like some milk ________breakfast. 4. What ____ going to the park? 5. It's time________ school. 6. We live____...
【简答题】About the year 1900, people in London often saw a small boy waiting outside the London theatres. He looked very thin, but his blue eyes were determine(坚定). His name was Charlie Chaplin. He was there b...
【简答题】I _______(go) and spoke to the manager. 2.Mr. Sweeney ________(call) when you were out. 3. I ______(be) born( 出生 ) in 2008. 4. He ________(go) out ten minutes ago. 5. His brother _______(lose) his key...
【判断题】He
was looking for a job so that he could make some money to pay for his tuition.
A.
正确
B.
错误
【简答题】A. He broke his leg. B. He has caught a cold. C. He has a stomachache. D. He has a toothache. 7. A. At 2 o'clock this afternoon. B. At 3 o'clock this afternoon. C. At 10 o'clock this morning. D. At...
【单选题】以下有关扩频通信系统说法错误的是 。
A.
扩频通信是用速率比信息码高得多的伪随机扩频码改造发送信号。
B.
扩频通信使系统抗干扰能力增强。
C.
扩频通信系统中在接收端经过相应的解扩处理恢复原始信息。
D.
扩频通信在发射信号功率不变情况下，频谱展宽，幅度不变。
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