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【单选题】
Read the paragraphs below. Then carefully consider the questions that follow, and, in the spaces provided, write the letters of the best responses. A successful doctor is scheduled to operate on a patient at 8 a.m., but it has snowed during the night, and driving is difficult. Do you think the doctor will stay home in bed?Not if he or she is professional. This attitude of professionalism is the key to being a successful college student, too. And it is within your reach, no matter how well or how poorly you have done in school up until now. You cannot undo the past, but you can adopt an attitude of professionalism from now on. A11 you have to do is intend to take school seriousiy, and the rest will follow. By attending classes, turning in assignments on time, and coming prepared for tests, you will gradually build your skills. 1. The primary purpose of this paragraph is to _________
A.
present facts on student behavior.
B.
inspire students to be conscientious.
C.
entertain students with a dramatic story about professionalism.
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【简答题】在林木采种时,通常把()成熟作为树木种子成熟的标志。
【判断题】确定花卉种子采收时间,生产上多以生理成熟作为种子成熟的标记。
A.
正确
B.
错误
【多选题】种子成熟的标志有
A.
养料输送已经停止,干物质不再增加
B.
种子含水量降低到一定程度
C.
果种皮呈现品种故有颜色
D.
种胚具有萌发能力
【简答题】在林木采种时,通常把()作为树木种子成熟的标志。
【判断题】花卉种子采收时,以形态成熟作为种子成熟的标志,来确定采种时间。
A.
正确
B.
错误
【单选题】已知液压泵转速为1000r/min,排量为160ml/r,额定压力为30MPa,实际输出流量为150L/min,泵的总效率为0.87,则:泵的理论流量为( )
A.
150 L/min
B.
160 L/min ‍
C.
170 L/min
D.
180 L/min ‍
【简答题】简述种子成熟的标志。
【判断题】在定义构造函数时,习惯上将函数名首字母大写。
A.
正确
B.
错误
【单选题】已知液压泵转速为1000r/min,排量为160ml/r,额定压力为30MPa,实际输出流量为150L/min,泵的总效率为0.87,则:额定工况下,泵的机械效率为( )
A.
0.928
B.
0.938
C.
0.948
D.
0.918
【简答题】种子成熟的标志是( )。
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