Venezuela's oil is also of poorer quality than its Saudi equivalent. Its sour, heavy crude is difficult to extract and refine, while its high sulphur content makes it corrosive to pipelines. A resurgence of Venezuela's industry could pose problems for Canada, which produces similarly viscous oil and exports much of it to the US, but analysts reckon the risk is minor.
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"Poor relationships" between team members, including obstetricians and midwives. Racist and bullying behaviour of senior clinicians was not always dealt with by management，详情可参考heLLoword翻译官方下载
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▲ 传统防窥膜结构，图片来自@上海复瞻智能科技