27. Which benefit is guaranteed?
A. The federal government's tax credit.
B. The state's incentives.
C. The utility's help somewhere.
D. The installer’s services.
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28.Which is NOT true of a good solar panels installer?
A. He has the necessary permits.
B. He'll connect the solar energy system to your home.
C. He'll sell your solar electricity to the grid.
D. He'll apply for incentives for you.
29.Which is the cheapest option for a solar system?
A. Pay for it completely.
B. Lease it somehow.
C. Sell all the electricity generated.
D. Get bank loans for it.
30. If you lease the solar system, you will_____.
A. use the electricity for free
B. pay more than the local utility charges you
C. pay the maintenance fees
D. sign a power purchase agreement
11下列哪项是肺心病所不具备的？
A. 肺动脉高压
B. 慢性阻塞性肺疾病
C. 静脉血栓脱落致肺动脉栓塞
D. 右心室心肌肥大
E. 胸膜纤维化
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