单循环病害的流行程度主要取决于（）。_爱下问搜题

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问题填空题

单循环病害的流行程度主要取决于（）。

答案

参考答案：初始菌量

选择题

如图所示装配仪器，接通直流电源，电解饱和食盐水，则电解片刻，在碳棒和铁钉表面都有气体生成，其中碳棒表面生成的气体是（）

A．Cl₂

B．O₂

C．H₂

D．HCl

单项选择题

Passage Two

In the foreign exchange market, which is made up of banks’ traders and brokers, prices (61) every minute (62) to supply and demand. For safety’s sake, a branch will get a rate from their traders for a big transaction. Therefore the traders give their branches lists of exchange rates (63) they may buy and sell notes and payments in the main currencies.
Whenever a bank in Britain makes a payment in foreign currency, or makes a payment in sterling to a non-resident, the payment has first to (64) under British exchange control regulations. The bank itself can usually authorize the payment after seeing a document such as an invoice to show that the payment is due; but cases (65) borrowing and lending have to be referred to the Bank of England.

A．authorizing

B．authorize

C．be authorized

D．have been authorized