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【单选题】
接种和培养花药时应注意的事项的一组是 ①不损伤花药 ②彻底去除花丝 ③幼小植株形成后需要光照 ④花药开裂释放出的幼小植株会分别发育成单倍体，无需分开 [ ]A.
①②③
B.
①②④
C.
②③④
D.
①③④
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举一反三
【单选题】______ your Enquiry No.123, we are sending you a catalogue and a sample book for your reference.
A.
According
B.
As per
C.
As
D.
About
【单选题】日前国际上应用范围最广、用量最大、灭火成功率最高、造价较低的固定灭火系统,并被公认是最为有效的建筑火灾自救设施的是( )。
A.
室内消火栓灭火系统
B.
自动喷水灭火系统
C.
水幕系统
D.
雨淋灭火系统
【单选题】Your enquiry letter has ____our careful attention.
A.
drawn
B.
brought
C.
received
D.
invited
【单选题】I could not have fulfilled the task in time if it ______ for your help.
A.
had been
B.
has been
C.
was not
D.
had not been
【简答题】Your
enquiry for cotton shirts has been referred to us for attention.A. 涉及 B. 查阅 C. 提交 D. 转交
【单选题】( )your Enquiry No. 123, we are sending you a catalog and a sample book for your reference.
A.
According
B.
As per
C.
As
D.
About
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