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【简答题】
若MCS-51单片机采用12MHz的晶振，它的机器周期（），ALE引脚输出正脉冲频率为（）。
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举一反三
【单选题】Questions 16 and 18 will be based on the following news item.---18
A.
How listeners in different cultures show respect.
B.
How speakers can win approval from the audience.
C.
How speakers can misunderstand the audience.
D.
How different Western and Eastern art forms are.
【多选题】图示刚地弓形虫的生活周期，请问弓形虫病的传播方式有（ ）
A.
通过胎盘传播给胎儿
B.
吃入含有卵囊或包囊的食物与水
C.
长期接触生肉者
D.
与猫、狗密切接触
E.
输血
【单选题】Questions 16 and 18 will be based on the following passage.---16
A.
About 4,000 years ago.
B.
About 3,000 years ago.
C.
About 2,000 years ago.
D.
About 1,000 years ago.
【单选题】Questions 16 and 18 will be based on the following passage.---18
A.
Horsemen
B.
Brass doors
C.
Drops of water
D.
Metal balls
【单选题】Questions 16 and 18 will be based on the following passage.---16
A.
In green forests.
B.
In dry deserts.
C.
In the Pacific Ocean.
D.
In the North Pole region.
【简答题】Questions 16 and 18 will be based on the following passage.
【单选题】Questions 16 and 18 will be based on the following news item.---18
A.
Plotting to kill the president.
B.
Plotting to kill the Vice-president.
C.
Plotting to bombard the capital city.
D.
Plotting to overthrow the government.
【单选题】Questions 16 and 18 will be based on the following passage.---18
A.
They are very intelligent.
B.
They are the most intelligent.
C.
They are more intelligent.
D.
They are less intelligent.
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