In the A, B, C, D and F grading system, the first four letters are typically considered passing grades.

在 A、B、C、D 和 F 评分体系中，前四个字母通常被认为是及格。

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Figure 3: Performance TAB shows you a letter grade (a, b, c, d, f) and a percent grade (1-100).

图3：性能标签使用字母(A, B, C, D, F)表示等级以及当前等级(1 - 100)。

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The testing, which began in June 2007, put the MALD through a series of flight profiles including jettison and powered flight tests from both F-16 and B-52 aircraft.

这次测试开始于2007年6月，在飞行测试中，使用了F-16战斗机和B-52轰炸机作为载机，对MALD进行了各种飞行轨迹的测试，包括抛射和动力飞行测试。

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Most American colleges and universities use the grading system of A,B,C,D and F.

VOA: special.2009.03.05

This refers--this actually goes back to B.F. Skinner, a psychologist who flourished in the first half of this century.

这要追溯到B.F.斯金纳,一位活跃在上世纪前期的心理学家

耶鲁公开课 - 金融市场课程节选

int A Well, one, function has called swap, takes one int called A, printf followed by another int called B, and as we've seen with print F, if you have multiple arguments, you separate them by commas.

好的，函数叫做swap，一个参数是，另一个参数是int，B，我们看到的,如果你有好几个参数，把它们用逗号分开。

哈佛公开课 - 计算机科学课程节选

Mercedes-Benz has the A-Class E Cell, sold only in Europe, and the B-Class F-CELL, but plans to debut the SLS-AMG E Cell in a battery electric version by 2013.

FORBES: Super Cars And The Changing Landscape Of Electric Luxury

"The fact that some airlines have received A's and B's and others D's and F's on this report card also shows that providing decent customer service and avoidance of strandings is both achievable and should not place an undue burden on the airline industry or lead to higher ticket prices, " the report's executive summary said.

CNN: Delta one of top airlines to get an 'F' in report

For the Hedged Equity Fund, portfolio managers will take long positions--the outright purchase of equities--primarily in stocks that have ratings of A or B and short positions primarily in stocks that have ratings of D or F.

FORBES: Boomers Leap Into Financial Safety Net