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[单选题]
一个热电偶产生的热电势为E0，当打开其冷端串接与两热电极材料不同的第三根金属导体时，若保证已打开的冷端两点的温度与未打开时相同，则回路中热电势
A
增加b.减小c.增加或减小不能确定d.不变
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试题答案：
D
答案解释：
该题干即为第三导体定律，故选D
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Passage ThreeQuestions 61 to 65 are based on the following passage.
2.
California families are facing a rapidly mounting uphill battle to make enough money to provide basic household essentials, according to a new study conducted by the California Budget Project. The research compiled by the Sacramento-based non-profit organization concluded an average two-parent family with one employed adult in California needs to make $51,177 a year, or $24.60 cents an hour, to pay for housing, transportation, food, utilities, child care, health coverage, taxes and other basic expenses. The number grows significantly higher in the Bay Area, the state's most expensive region.A Bay Area family of four with two working adults living in rental housing needs a combined income of $79,946 to cover essential needs.That number is more than four times greater than the $19,157 income level recognized by the federal government as impoverished. The study is the fourth semi-annual survey conducted by the California Budget Project since 1999. California Budget Project executive director Jean Ross said helping state officials and residents understand the numbers found in the report is crucial to moving families toward self-sufficiency. "How should we be targeting some of our programs and policies? How much do young people need to earn and what kind of a job should they be looking to train for if they want to have that salary that can support a family?" CBP said the project was based on actual costs or generally accepted fair standard prices based on weighted averages found in ten California regions.
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11．根据《中华人民共和国中外合资经营企业法》的规定，约定合营期限的合营企业，合营各方同意延长合营期限的，应在距合营期满______前向审查批准机关提出申请，审查批准机关应自接到申请之日起______内决定是否批准。
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