The phrase “rounding on” （） most probably means

写出以下单词的中文意思：rounding n.

A.going the rounds of

B.rounding up

C.making the rounds of

D.rounding on

A.1020.15

B.1020.13

C.1020.131

D.1020.10

A.A. Nasality

B.B. Voicing

C.C. Aspiration

D.D. Rounding

A.1020.20

B.1020.17

C.1020.18

D.1020.00

To round is to delete or(66)one or more of the least significant digits in a positional(67)and to, or not to, adjust the part retained in accordance with some specified rule. The purpose of rounding is usually to limit the (68) of the numeral or to reduce the number of characters in the numeral, or to do both these things.The most common arithmetic forms of rounding are rounding down, rounding up and rounding off. Rounding down is defined as making no adjustment to the part of the numeral that is retained. Rounding up means adjusting the part of the numeral that is retained by adding 1 to the least significant of its digits and executing any necessary carries, if and only if One or more non-zero digits have been deleted. Rounding off (69) adjusting the part of the numeral retained by adding 1 to the least significant of its digits and executing any necessary carries, if and only if the most significant of the digits deleted was equal to or greater than half the(70) of its digit place.

A．simplify

B．reduce

C．abbreviate

D．omit

A.going the rounds of

B.rounding up

C.making the rounds of

.

A.toward the inside of the bend

B.toward the outside of the bend

C.toward the center of the river just before the bend, then change course for the river’s venter after the bend

D.in the river’s center

A.绝对误差一般保留一位有效数字. The absolute error generally retains one significant digit.###SXB###B.测量误差的有效位数的修约原则是：五下舍，五上入，逢五凑偶。 The principle of rounding off the significant digits of measurement error is, Give up less than five, Carry over 5, It's exactly five, making the first bit even.###SXB###C.加减法运算结果的非准确位与参与运算的所有数字中非准确位数值最小者相同. The result of addition and subtraction is the same as the least of all the digits involved in the operation.###SXB###D.乘除法运算