服强心苷类药物时需加强对心率、节律的监测，脉率低于（）次／min或节律不齐时暂停服用，并报告医师。
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Ireland has the following demographic features except（）.
A. it has a low birthrate
B. it has a late marriage age
C. it has an excess of females in the population
D. it has a high proportion of bachelors and spinsters of all age
精馏塔的进料为饱和气液混合物时，进料线的斜率q/（q-1）为（）。
某滚子链“12A-2×84 GB1243-83”各数字符号说明什么？
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