An integral part of a blowout preventer that serves as the closing element on an open hole，and whose ends do not fit around the drill pipe but seal against each other and shut off the space below completely is the（）.
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Which is NOT a part of an anchor（）.
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An interjection is a part-of-speech that directly expresses
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The business being separate and distinct from the owners is an integral part of the:
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which the mind and body are considered integral parts of the whole being, and both aspects are examined together. Studies have shown that a continuing state of ______
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An important part of the national government is the Foreign Service，a branch of the Department of State．
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Modern —— health records are meant to give doctors an integrated view of a patient’s care,medical history and treatments.