Listen to the conversation and choose the best answer to each question you hear. 1.
A government office.
B. A hotel.
C. An insurance company.
D. A travel agency.
查看答案
2.
A. Grey.
B. Green.
C. Red.
D. White.
3.
A. The 3rd office on the right on the 5th floor.
B. The 5th office on the right on the 5th floor
C. The 3rd office on the left on the 3rd floor.
D. The 5th office on the left on the 3rd floor.
下列哪种水不能作物无土栽培上营养液配置的水源 （）
A. 自来水
B. 海水
C. 井水
D. 河水
无土栽培营养液配置时PH值应调整为 （）
A. 6.0-8.0
B. 7.0-8.5
C. 6.5-8.5
D. 6.5-9.0
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