托烷类生物碱的特征反应 A．Kedde反应 B．Vitali反应 C．Keller-_爱下问搜题

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问题单项选择题

托烷类生物碱的特征反应

A．Kedde反应
B．Vitali反应
C．Keller-Kiliani反应
D．Marquis反应
E．坂口反应

答案

参考答案：D

完形填空

One afternoon I toured an art museum while waiting for my husband to finish a business meeting. I was looking forward to a quiet   21  of the splendid artwork.
A young   22  viewing the paintings ahead of me   23  nonstop between themselves. I watched them a moment and decided the lady was doing all the talking. I admired the man’s   24  for putting up with her   25  stream of words.   26  by their noise, I moved on.
I met them several times as I moved   27  the various rooms of art. Each time I heard her continuous flow of words, I moved away   28 .
I was standing at the counter of the museum gift shop making a   29  when the couple approached the   30 . Before they left, the man   31 into his pocket and pulled out a white object. He   32  it into a long stick and then   33  his way into the coatroom to get his wife’s jacket.
“He’s a   34  man,” the clerk at the counter said. “Most of us would give up if we were blinded at such a young age. During his recovery, he made a promise his life wouldn’t change. So, as before, he and his wife come in   35  there is a new art show.”
“But what does he get out of the art?” I asked. “He can’t see.”
“Can’t see! You’re   36 . He sees a lot. More than you and I do,” the clerk said. “His wife   37  each painting so he can see it in his head.”
I learned something about patience,   38  and love that day. I saw the patience of a young wife describing paintings to a person without   39  and the courage of a husband who would not   40 blindness to change his life. And I saw the love shared by two people as I watched this couple walk away, their arms intertwined.

B．independence

C．expectation

填空题

中棚一般跨度在（）m。一般跨度为6m时，以高度（）m，肩高（）m为宜；跨度为4.5m时，以高度（）m，肩高（）m为宜。