In a microbarograph，the pen should be checked and the ink well filled（）.<br>A:each time the chart is changed<br>B:once per month<br>C:once per week<br>D:daily

In a microbarograph，the pen should be checked and the ink well filled（）.
A:each time the chart is changed
B:once per month
C:once per week
D:daily

出自：海船船员证

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