( )是焊接工艺评定试验的前提因素，亦即焊接工艺评定的基础。
A. 钢材的选择
B. 材料的焊接性试验
C. 焊接方法的选择
D. 焊接参数的确定
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在中国境内履行的( )必须适用中国法律。
A. 中外补偿贸易合同
B. 中外加工承揽合同
C. 中外合资企业合同
D. 中外专利技术转让合同
You must phone the police when you find any suspicious guy _________ the house late at night.
A. hanging out
B. hanging up
C. hanging round
D. hanging together
During what period of time does the novel take place
A. 1400s.
B. 1700s.
C. 1800s.
D. 1900s.
Where can the tallest trees be found
A. In Muir Woods.
B. Near Los Angeles.
C. In San Francisco.
D. Along the Northern California coast.
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