变更权属调查的步骤，主要包括：①填写变更地籍调查表；②填写变更权属调查记事及调查员意

20世纪70年代以来国际金融创新发展的最主要产品是()。

A.金融远期

B.金融期货

C.金融期权

D.金融互换

下列的几种有关噪声的说法中，其中不正确的是[ ]

A.噪声只是由机器、车辆等机械设备发出的声音，污染环境

B.噪声刺激人的神经，使人感到恐慌、疲惫、不安等

C.噪声可以刺激杂草种子的提前发芽，便于农民提前锄草，保护庄稼

D.噪声有时也是由美妙的音乐产生的

Today I visited the Smiths — my first time visit 1.________

to a American family. They live in a small 2 _________

town. It was very kind for them to meet me 3.__________

at the railway station and drove me to their home 4.__________

The Smiths did his best to make me feel 5.__________

at home. They offered me coffee and other 6.__________

drinks. We have a good time talking and laughing 7.__________

together. They eager to know everything about 8.__________

China and asked me lots of question. In fact, 9 .__________

they are planning to visit China in next year. 10.__________

两种不同的商品可以按一定的比例互相交换的原因，在于它们( )。

A．对人们有共同的效用
B．有不同的使用价值
C．在生产中都耗费了一般人类劳动
D．都是具体劳动的产物

拱与拱端面为何要尽量做成全径向接触？坝面倒悬会在什么期间在何面出现拉应力？