问题
单项选择题
胎儿心电图通常可显示较规律的图形是妊娠的
A．2周
B．12周
C．10周
D．14周
E．16周
答案
参考答案：B
解析： 胎儿心电图通常于妊娠12周后显示较规律的图形。
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胎儿心电图通常可显示较规律的图形是妊娠的
A．2周
B．12周
C．10周
D．14周
E．16周
参考答案：B
解析： 胎儿心电图通常于妊娠12周后显示较规律的图形。
| 单句改错。 | |
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