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问题 问答题 简答题

桃树整形中应该注意什么问题？

答案

参考答案：（1）主干高度：一般主干高度为30-50cm，再留20-30cm整形带；

（2）平衡生长势；

（3）主枝基部着生方式：主枝上面两个宜采用邻接，与下面一个邻近；

（4）因树修剪，随枝作形。

单项选择题

描述标记免疫分析方法测量值与真实值的符合程度指标是（）

A.灵敏度

B.精密度

C.准确度

D.特异性

E.符合率
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单项选择题

We know a computer is a machine that processes data (stored in main memory) into information, under control of a stored program. We also know that, internally, a computer is a binary machine; thus the data and the program instruictions must be stored in binary form. Characters are represented in (71) . Numbers are stored as binary numbers, with each bit’s positional value significant. A computer’s main memory is divided into bytes, words or both (depending on the system), and each of these basic storage units is assigned an (72) . Using this address, the processor can read or write selected bytes or words.

The processor consists of a clock, an instruction control unit, an arithmetic and logic unit, and registers. Once a program is stored in main memory, the processor can begin to execute it. During (73) , the instruction control unit fetches an instruction from main memory; during (74) , the arithmetic and logic unit executes it. Precisely timed electronic pulses generated by the clock drive this basic (75)

（75）处填（）。

A．clock pulse

B．instruction

C．memory access

D．machine cycle
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